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Enhancements:
- Ensured that HoloViews operations such as datashade, aggregate and regrid do not drop the coordinate reference system on the input element (https://github.com/holoviz/geoviews/pull/118)
- Unified WMTS support across backends, bokeh and matplotlib now support rendering ``{X}_{Y}_{Z}`` based web tiles (https://github.com/holoviz/geoviews/pull/120)
- Handle projecting of empty Elements (https://github.com/holoviz/geoviews/pull/131)
- Set Image element NaN coloring to transparent (https://github.com/holoviz/geoviews/pull/136/commits/f1f29607079f1f86bce56187dd7a98ca2a1d9eff)
- Overhauled website with new theme (https://github.com/holoviz/geoviews/pull/106)